All websites show a “502 Bad Gateway” error in a web-browser.
Apache fails to start. The following error message is returned by Apache configuration checker:
on CentOS/RHEL-based distributions
# httpd -t
on Debian/Ubuntu-based distributions
# apache2ctl -t
Wrapper /var/www/cgi-bin/cgi_wrapper/cgi_wrapper cannot be accessed: (2)No such file or directory
/var/www/cgi-bin/cgi_wrapper/cgi_wrapper is missing.